diff --git a/applets/systemloadviewer/package/contents/ui/SystemLoadViewer.qml b/applets/systemloadviewer/package/contents/ui/SystemLoadViewer.qml
--- a/applets/systemloadviewer/package/contents/ui/SystemLoadViewer.qml
+++ b/applets/systemloadviewer/package/contents/ui/SystemLoadViewer.qml
@@ -248,15 +248,16 @@
         var swapTotal = swapFree + swapUsed
         var swapPart = i18n("Swap: %1/%2 MiB", Math.round(swapUsed), Math.round(swapTotal))
 
-        var cacheDirty = parseFloat(dataSource.data[dataSource.cacheDirty].value) / 1024
-        var cacheWriteback = parseFloat(dataSource.data[dataSource.cacheWriteback].value) / 1024
+        var cacheDirty = parseFloat(dataSource.data[dataSource.cacheDirty] ? dataSource.data[dataSource.cacheDirty].value : 0) / 1024
+        var cacheWriteback = parseFloat(dataSource.data[dataSource.cacheWriteback] ? dataSource.data[dataSource.cacheWriteback].value : 0) / 1024
         var cachePart = i18n("Cache Dirty, Writeback: %1 MiB, %2 MiB", Math.round(cacheDirty), Math.round(cacheWriteback))
 
         if (cpuClockPart === "") {
             return [cpuLoadPart, memoryPart, swapPart, cachePart].join("\n")
         }
-
-        return [cpuLoadPart, cpuClockPart, memoryPart, swapPart, cachePart].join("\n")
+        else {
+            return [cpuLoadPart, cpuClockPart, memoryPart, swapPart, cachePart].join("\n")
+        }
     }
 
     function fitCpuLoad(load) {